A $250,000 reward is being offered for information about the mysterious disappearance of Queensland woman Novy Chardon on the Gold Coast.

There has been no sign of the 34-year-old mother of two since she was reported missing from her Upper Coomera home in February last year.

Police last week dug up the backyard of a home at Mount Nathan on the Gold Coast Hinterland and found parts of a white ute believed to be connected to Ms Chardon's disappearance, but no-one has been charged.

Police Minister Jack Dempsey says it is a serious crime and $250,000 is the maximum reward available.

He says the reward will be offered to anyone with information that leads to the arrest and conviction of those responsible for her murder.

Mr Dempsey says it is vital police uncover what happened.

"Any information, no matter how small, could be the breakthrough that detectives need," he said.

Detective Superintendent David Hutchinson says an accomplice not involved in Ms Chardon's suspected murder who provides information can qualify for indemnity from prosecution.

"We are quite convinced more than one person was involved and we are quite convinced there are people out there in the community who have information that can help us," he said.

"The reward is targeted towards those people and we would strongly encourage them to come forward."

Detective Hutchinson says investigators have made good progress but need a small piece of information to make an arrest.

"We would encourage any potential accomplice out there to consider that very strongly - do they want to wait until the police knock on their door?" he said.

"Or do they want to make the telephone call and tell the police what they know and look towards an indemnity and reward."